The robot has mechanisms such as propellers to control its movement in the pool. The humanistic nature of the robot really makes me want to build my next project to relate to water somehow. I hope to see a camera or something attached to it.

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3. VINTAGE CALCULATOR

OWNER: Museum of Interesting Things

CREATOR: Otto Meuter (around 1935)

This calculator has a mysterious and inviting nature, which was also the case at the time when it was first introduced in Berlin, Germany by Meuter and also Kuebler, a business man. It can only add or subtract. Numbers are entered with the vertical sliders (one set for positive numbers and one for negative numbers) using the accompanying stylus. The result appears in the circular windows in the middle. Use the pull rod at the top of the right panel to clear/restart.